Because the article's title is "The Importance of Being Idle" not The Importance of doing something that you enjoy"? It's all-too-easy to enjoy being idle, but ultimately it's also a bit mindless, and this deprives us of deeper forms of enjoyment and engagement.

it seems like you are interpreting this as an argument for "not doing work" - but it's not the case. It is more so saying that rest is important too. You ever have the experience that you are bashing your head against something, take a break to stop working on it, and come back refreshed and solve it quickly? Just because something is important, doesn't mean you should do that thing, single-mindedly, at the expense of other things.

Two things can be important

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